Door-motor.



T. FARMER,1R.

DOOR MOTOR.

APPLmATloN FILED 11111117.1915.

1L ,lp Patented 001. 15, 1918...

2 SHEETS-SHEET Z.

' vided at its outer `door ticular, I provide a magnet lever that operates the door.

l axiomas FARMER, JN., or NNW YORK, N. Y., Ass'IeNoa To CONSOLIDATED CAN.-

HEATING COMPANY, 0F ALBANY, NEW YORK,

VIRGINIA.

assises.

To all whom t may concern:

Be it known that I, THoMAs FARMER, Jr., a citi-zen lof the United States, residing at NewV York city, borough of Manhattan, county and State of New York, have invented certain new andV useful Improvements in Door-Motors, the following being a full, clear, and exact disclosure of the one form ,of my invention which I at present deem preferable.y

For a detailed form of my invention, reference may be had to the following specification and to the accompanying drawings, which illustrate my invention, wherein# Figure l shows my motor applied to a Fig. 2 a plan view thereof ony a larger scale;

Fig.

Fig. t is a Fig. 5 is a nect'ions.

My invention operation of a door by matic motor electrically 3 is a front elevation thereof; rear end view and diagram of the electrical conmeans of a pneufor controlling the inlet and exhaust valves of each of the two `cylinders-of the motor and a push button for closing the circuit ofeach magnet. In addition, "I arrange that the magnet circuit, after being closed by the push button, shall be retained closed by the action of the motor itself until after the motor stroke is completed or nearly so, circuit is automatically broken. This arrangement is duplicated for each cylinder of the motor.

Referring'to the drawing, A and B represent two air cylinders, one being a duplicate of the' other, and the two being employed for the opening and closing movements of the door respectively. The pistons of the two cylinders are connected by a rack bar C which`intermeshes w'itha sector D on a Such an arrangement is well known-and calls for no further description. rI`he lever itself is of a telescoping construction. It is composed of a fiat box-like section E, in which slides one end of a connecting rod F which is proend with a.l short spindle f by which it may be jointed to the door or to a second lever that is connected to the DOOR-MOTOR.

Specication of Letters Patent.

description of the present' relates to the mechanical.

controlled. In parwhen the magnet A CORPORATION 0F WEST Fatented Oct. 15, 1918.

Application mea :my 17, 1915. serial No. 40,378.

door. Any desirable form of connection between the door and the rod F may be employed, but for illustration I have shown the rods as jointed to a sleeve G free to slide on a guide rod g secured to one edge of the door H, as appears in Fig. 1. When the door is closed the rod F will be in its horizontal position, as shown in that figure. The rod F, where it enters the box-section E, is provided with a slot f1 through which passes a pin f2 to retain it in the section E. The rear end of rod F rests against springs J J which tend to force the rod outwardly and thereby extend the telescoping door-operating lever. When, however, the door is closed andthe rod F is in its horizontal position at right angles tothe door, as in Fig. l, the door can be opened by hand to a certain extent owing to the yielding of the springsJ J. When, how-- ever, the door is open, or is being moved from open to closed position, or vice versa, the angular relation of the rod F to the door will cause a side pressure of the rod against the box-section E that will prevent ,the rod from being pushed into the section E against the pressure lof the springs J J. By this means the danger of a persons hand or arm being injured by being caught in the door is averted, the strength of the springs J J not being sufficient to cause injury. At the same time, if a ladys dress 'or other article, be cau ht in the door it can readily be release by opening the door a short distance against the pressure of the springs.

The box-section E is pivoted to the cylinder casting by means of a pin I, which is passed through the bearings K K1 formed on the cylinder casting and through the said box-section E and retained by a split pin '5. The box-section E is preferably cast in one piece with an extension El on its rear side which is, in turn, integralwith the toothed sector D which is engaged by the rack C and is, moreover, provided with an angular plate E2 whichy extends parallel with the box-section E and is concentric with the bearings K K1. To the aforesaid part E2 is attached a drumL of insulating material carryingcontact Iplates l and 2, also a short contact plate 3 and a longer contact plate 4: upon which suitable contact fingers are arranged to bear, as will be hereinafter described.

At the rear end of the cylinder B is formed a hollow casting B1 which contains theinlet and exhaust valves of thecylinder B, together with the operating magnet therefor. A similar hollow casting A1 is provided for cylinder` A to contain the valves and operating magnet of that cylinder.

Turning to Fig. 5, the operating magnet for the valves of cylinder B are shown at 20, the armatureA 21 of the magnet being provided with a stem 22 of non-magnetic material which'passes down through a chamber 23 and is there provided with a valve 24 designed to coperate with a valve seat in a partition which separates the said chamber 23 from a chamber 25 which leads to the rear end of the cylinder B. The chamber 23 is provided with an exhaust duct 26 in communication with the atmosphere. The stem 22 also carries a second valve 27 that cooperates with a valve seat in a partition which separates chamber 25 from a chamber 28 that communicates with the source of air supply. A spring 29 tends to hold the valves 24 and 27 in the position shown. in Fig. 5, wherein the cylinder B is open to the eX- haust 26 by way of the chamber 25 and the opened valve 24, the admission vvalve 27 be ing now closed. When, however, the magnet 20 is energized the conditions will be reversed, the valve 24 being closed, thereb shutting olf the exhaust, and the valve 2 being opened, thereby admitting air to the cylinder.

The insulating drum L, which, as before described, is set concentrically with the sector D and the box-section E so as to rotate therewith, is shown in Fig. 5 with its contact plates developed in a plane. The contact spring or finger 5 bears constantly on the metallic plate 1 of the drum L and a similar spring or finger 6 bears constantly on the similar metallic plate 2. The inner edge of plate 1 is provided with a vertical cam-flange 12 and the plate 2 is provided with a similar cam flange 13. These flanges are tobe engaged by a contact roller 9 pivoted on the stationary plate 10 and provided with a spring 11 to throw the roller to'one side or the other of its dead center whenever that roller'is forced over to one side or the other by the cam-flange 12 or the cam-flange 13. T represents a battery and B3*B8 represent push buttons, which, when ushed will close circuits from the battery through the wires 30 and 31 to'the respective magnets 20 and thence to ground. When either magnet 20 is energized the exhaust valve 24 of its 'casing is closed and the admission valve of said casing is opened. Referring to Fig. 5, assuming that the ri ht hand switch B.3 is moved to the dotted 11ne position to close the circuit, the magnet 20 will be energized to close valve 24 and open the pistons of the rack C and-sector il), will 'start to operate coincides with the valve 27 whereupon the air will enter behind the `cylinder B "and/through the door. At the same time'it will start the drum L to rotating in the direction indicated by the arrow 40 whereupon the roller 9, which'is shown in the figure as'being'held vby the spring `11 on the lower side of its dead center, will come into engagement with the flange 13 on plate 2 and establish electrical connection therewith. That will close a second, retaining circuit through the magnet 20 independent of the one heretofore traced B3. This retaining circuit is from battery T by the wire 50 to the plate-10 and roller which contains the push button 9, thence to the plate 2 and the contact y spring 6, tothe wire 51 which leadsby the wire 31, to the magnet 20 and thence to ground. This circuit will be maintained until the piston reaches the end of its stroke, it being rememberedthat the movement of the piston, inaugurated by controlling valve B', causes a simultaneous movement of the drum L in the'direction of the arrow 4 of Fig. 5. Thus, during the stroke of the piston, the roller 9 will travel along flange 13 of plate 2-or'more exactly, the flange 13 will travel along. roller 9-until near the cnd of said stroke the roller will encounter the curved part ofsaid flange 13 (which is shown in Fig. 5 at the left hand end of the flange) and will thereby be thrown across its dead center line. That will cause the roller to part from flange 13 with a snap and so break the maintaining circuit aforesaid. The parts will then remain at rest,-

the roller 9 standing in a position to engage the opposite flange 12 on the plate 1 whenever the piston starts on its return stroke. The return stroke will be inaugurated by closure of the left hand switch B3 which will control the ma net of valve A and admit air to cylinder precisely as the right hand switch B3 controlled the magnet of valve B and admitted air to cylinder B as here tofore described. It will be understood that the admission of air pressure to one cylinder openin of the exhaust of' the other cylinder. The said return stroke, under the force of cylinder A, will cause 'a reverse movement of drum L in a direction opposite to said arrow 40 and the roller 9 will first engage the left hand end of flange l2 and travel along that flange during the said return stroke. Near the end of the stroke the roller will encounter the curved part of flange 12 (at the right hand end of the flange in Fig. 5) and be thereby deiected downward until it snaps back across its dead-center line "to the position shown in said Fig. 5. In thus traversing iiange 12 the roller will maintain a retaining circuit for the magnet of valve A exactly as it maintained the retaining circuit for the i..

A the plate i2. The push magnet of valve B while traversing fiange' 18. In like manner it will break the retaining circuit with a snap when it reaches the curved end of the flange and is thereby thrown across its dead center line. The action in one direction is a duplicate of the action in the opposite direction, being started by`manually closing one of the valve-magnets; that being followed by the starting of the door and the closure by roller 9 of a retaining circuit for the corresponding magnet, which circuit is automatically broken with a snap at the end-of the run of the door, the parts beingleft in position ready for the return run whenever the other switch B3 is closed. It will, therefore, be possible to start the door into operation vby merely closing the push button B3 for a brief period suflicient to start the motor and close the retaining circuit by Contact of the roller 9 and button may then be released but the motor will continue to operate to the end of its stroke. In Fig. 5 the arrows applied to the casing A and B indicate that the casing B is exhausting from the cylinder B at the same time that the motive fluid is flowing to the cylinder A. Said figure illustrates all of the parts in the positions which they have reached at the end of the last operation of the device by which the door was operated through supplying power to cylinder A. It is to be understood that as each cylinder received the motive fluid the other cylinder exhausts. If desired. a normally-closed push-button X may be located in wire 50 for stopping the door in case of emergency, but ordinarily the door will be permitted to make its complete run before the air is cut off from its motor and its exhaust opened. The arrangement for cylinder A is identical with the one just described for cylinder B. It should be observed that plates land 2 are both secured to the drum L by screws which pass through slots in the plates. By this means the plates can be adjusted in position on the drum and the time at which the retaining circuit will be broken thereby adjusted correspondingly.l

The druln L also carries a short contact plate 3 which in the norlnal position of the drum, the door being then closed. bridges between contact fingers 7 and 1i to close the usual signal circuit which notiiesthe motorman that all the doors on the train have been shut. Whenever the door is open this circuit is broken at the contact fingers 7 and l-L. lt is not necessary to describe this signal circuit further. since it is one. well known in the art. 'On the other hand, the contact plate -l on drum L actsl to bridge between the fin ers 8 and 16 whenever the door is opened. he

, the motor,

fingers 8 and 16 are contained in a brakecontrolling circuit which serves to automatically adjust the force of the brakes with respect to the load carried on the car, such adjustment being effected when the train is stopped and the doors are opened. This brake circuit need not since it is already known to the art and constitutes no part of my invention.

What l claim as new and desire to secure, by Let-ters Patent is:

1. A door-motor provided with a controlling valve, a magnet for operating said valve, a controlling circuit therefor, a circuit-closer for said circuit, and a retaining circuit for said `valve controlled by the motor at the ends of its stroke. l

A door-motor provided with a. controlling valve, a magnet for operating said valve, and a retaining circuit for said magnet which is both closed and opened by the motor. c

A door-motor provided with a controlling valve, a magnet for operating said valve, a starting circuit-closer for said magnet, a retaining circuit shunting said circuit-closer, and contacts in said retaining circuit operated byv the motor'.

4. A door-motor Aprovided with a controlling4 valve, a magnet for operating said valve, a starting circuit-closer for said magnet, a retaining circuit for said valve, a contact strip in said retaining circuit. of a length substantially equal to the length of stroke of and contacts coperating with said strip to hold said retaining circuit closed during the travel of the motor.

5. A door-motor provided with a movable piston and a controlling valve, rotatable contacts actuated by said piston, a magnet for operating the controlling valve, a starting switch for said magnet and a retaining circuit for the valve controlled by the said rotatable contacts.

6. A door-motor provided with a movable piston, a rotatable contact-drum operated by said piston, a controlling-valve for said motor, a magnet for said valve, and a retainingcircuit for said valve controlled by the contacts on said drum.

7. A door-motor provided with a controlling valve, a magnet for operating said valve, a starting circuit-closer for said magnet, a retaining circuit for the magnet, and

means for controlling said retaining circuit by the motor comprising a. rotary-contact provided with a cam surface and a dead-centered switch-contact operated by said cam.

In witness whereof I have hereunto set my hand, this 16th day of July, 1915.

THOMAS FARMER, JR.

be further described,- 

